API Audio Tranzformer LX

Effect Pedal for Electric Bass

  • Variable compressor with input / output switch
  • 3-Band equalizer +/- 15 dB with input / output switch
  • Discrete API circuit design
  • Input level adjustable (up to +30 dB)
  • Phase inversion switch for balanced and unbalanced output
  • Ground lift switch
  • Clip LED
  • Hard bypass switch
  • Dimensions: approx. 203 x 140 x 102 mm
  • Weight: 1.8 kg
  • Includes external 18 V power supply


  • Hi-Z instrument input: 6.3 mm jack unbalanced
  • Line output: XLR balanced
  • Hi-Z output (Amp): 6.3 mm jack unbalanced

These are other customers' choices:

Customers who looked at this item have bought these:

API Audio Tranzformer LX
42% bought this exact product
API Audio Tranzformer LX
Available immediately
Available immediately

This item is in stock and can be dispatched immediately.

Standard Delivery Times
611 € Add to Basket
MXR 10 Band Equalizer Silver
20% bought MXR 10 Band Equalizer Silver 169 €
Empress Effects ParaEQ w/Boost
8% bought Empress Effects ParaEQ w/Boost 299 €
Elektron Analog Drive
7% bought Elektron Analog Drive 169 €
API Audio Tranzformer GT
7% bought API Audio Tranzformer GT 629 €
Our most popular Equalizer Pedals
3 Customer Ratings:
  • 5
  • 4
  • 3
  • 2
  • 1
5 / 5.0
  • handling
  • features
  • sound
  • quality
Text ratings for this product are available in another language only so far
2 written ratings Read all reviews
de Automatically translated (Show original)
deOriginal review (Show translation)
Unfortunately there was an error. Please try again later.


Paul101, 22.04.2018
This preamp is excellent!
100% API sound for a relatively small price.
Powerful, present and musical sound.
Very fast, direct and hangs very well on the fingers.
Enormous gain reserves.
The EQ is rather mild and more like an add-on.
But he does a pretty good job.
The compressor is a real surprise!
Although only one button with 6 positions you have a lot of different compression available in conjunction with the gain. The compression is extremely high quality and absolutely live or to use in the studio. I had not expected that.
The compressor even beats most pedals in the 200-300 Euro class in my opinion.

As a pedal I would probably not use it, too big and heavy.
A pity is that the bypass switch is relatively nonsensical.
Once you have the preamp in the signal path, you do not want to turn it off. It sounds so good. A mute would be much better in my opinion.

The device is operated with an included 18V power adapter. This is very small and light. An integrated power supply would be much better.
The DI output delivers line level! (up to +28 dB !!)
It is designed for line inputs.
Here you have to connect an attenuator, if you want to connect the DI Out to a mic input of a desk.
Especially if it does not have a pad switch.
The unbalanced jack out is separately adjustable via the level knob and has plenty of reserves to be able to control PA power amps properly.

This preamp is highly recommended and a real asset to us bass players. To my knowledge, this quality is currently not for us bassists. Especially not for the price. For me, such a small dream has come true.

I am very excited.

Update / long-term experience:

After a few months, the TranZformer LX has become my indispensable sound center. Whether in the studio, live on stage or at home to practice. It is very hard for me to play without the API.
The sound of this device is fast, forward, with present, well-marked mid-highs. The sound always stays fat, dynamic and cultivated. The Lo End is open and still tight.
A preamp that you would not want better for the E Bass (and other signals as well).

Despite its simplicity, the EQ proves to be very good sound and practical.
I really like the compressor. It is rather a compressor of the vehement, the Attack-accelerating kind. Subtle leveling like optical compressors is not its strength. I use it rather in smaller setting with little gain. There he is especially with louder music such as. Rock is very effective and lays the bluff on the already very vehement sound of the API Tranzformer LX.

Of course, this is not a device that conjures up a good signal from a bad signal.
Anyone looking for coloring a la Ampeg or Mesa, is not served here.

Nevertheless, I consider this preamp to be one of the best preamps for the E-Bass ever.
Helpful · Not helpful · Report
Report rating…

Do you believe this rating to be inaccurate or unacceptable for some reason?

Send report
B-Stock from 566 € available
Free shipping incl. VAT
Available immediately
Available immediately

This item is in stock and can be dispatched immediately.

Standard Delivery Times
Share This Product
Your Contacts
Phone: +49-9546-9223-20
FAX: +49-9546-9223-24
test results:
Offers include 24% Greek VAT and are valid as long as stocks last. Shipping costs to Greece are 20 EUR, free shipping on orders above 298 EUR. Please click here for international Shipping rates. We do not accept liability for typographical errors or inaccurate information of any kind. *RRP = manufacturer's / distributor's recommended retail price in Germany
Sony WH-1000XM3 Black Steinberg Cubase Pro 10 Electro Harmonix Grand Canyon Harley Benton SpaceShip 80 w/Hardcase Roland VT-4 Hughes&Kettner BlackSpirit 200 the t.mix 201-USB Play Mackie FreePlay LIVE Bag Steinberg Cubase Elements 10 Friedman BE-OD Deluxe Overdrive Harley Benton SpaceShip 60 w/Hardcase Quilter Interblock 45
Sony WH-1000XM3 Black

Noise Canceling Headphones Wireless via Bluetooth (LDAC), Closed, Circumaural, 40 mm driver - dome (copper voice coil), Frequency response: 4-40000 Hz, Sound pressure level: 104 dB / mW, Impedance: 47 ohms, High-quality audio streaming with LDAC, Touch operation on...

to the product
375 €
Steinberg Cubase Pro 10

Audio MIDI Sequencer (DAW) 32 Bit integer and 64 bit float, Unlimited number of simultaneously usable audio and MIDI tracks, Supports up to 256 physical inputs and outputs, 5.1 surround support, Score Editor, Key Editor, Drum Editor, Sample Editor,...

to the product
566 €
Electro Harmonix Grand Canyon

Effect Pedal for Electric Guitar Delay and Looper, Digital operation, 12 Effect Types, Fully functional looper, Up to 3 seconds delay time, TAP tempo, Stereo outputs, 13 Delay presets, Looper has up to 16 minutes recording time, Unlimited number...

to the product
274 €
Harley Benton SpaceShip 80 w/Hardcase

Adjustable & Lightweight Pedalboard Rugged powder-coated aluminium frame, Covered in a carpet like material, Adjustable height and tilt, Easy power supply installation underneath the frame, Dimensions: (W x D x H) 800 x 390 x 70-85 mm, Weight:...

to the product
124 €
Roland VT-4

Roland VT-4; Voice Transformer; desktop effects processor for vocal effects; intuitive and creative handling via sliders, knobs and buttons; Vocoder-, Pitch-Shifting-, Harmonizer- effects and more; adjustable reverb effects; 8 user settings storable; up to 6 hours of battery operation (4x...

to the product
244 €
Hughes&Kettner BlackSpirit 200

Guitar Amp Head The secret behind the sound of the BlackSpirit 200 is the completely new technology developed especially for sound production: Bionic Tone Generating. Here the complex dynamic processes of classic tube circuitry has been reproduced and optimised...

to the product
799 €
the t.mix 201-USB Play

2 Channel DJ Mixer with USB / SD / Bluetooth Player 2 Stereo inputs: phono / line / MP3, 1 Microphone input with talkover: 6.3 mm Jack, Headphone output: 6.3 mm Stereo jack, Master Out: XLR / RCA, Rec...

to the product
89 €
Mackie FreePlay LIVE Bag

Mackie FreePlay LIVE Bag, FreePlay Live Portable PA Bag, hardshell lid with Mackie logo, accessories compartement on the side, heavy duty zipper, carry strap and handle, colours: black

to the product
70 €
Steinberg Cubase Elements 10

Audio MIDI Sequencer (DAW) 32-Bit integer and 64 bit float, Supports a maximum of 48 audio and 64 MIDI tracks, 24 instrument tracks and 24 physical inputs and outputs, Over 40 audio effects, 3 Virtual instruments: HALion Sonic SE,...

to the product
99 €
Friedman BE-OD Deluxe Overdrive

Effects Pedal Overdrive, 2 Channels, Authentic British overdrive sounds based on the legendary "BE-100" tube top section, Controls per channel: Volume, Gain, Bass, Middle, Treble & Presence, Separate tight switch per channel, True bypass, Effect on LED, Bypass and...

to the product
295 €
Harley Benton SpaceShip 60 w/Hardcase

Adjustable & Lightweight Pedalboard Rugged powder-coated aluminium frame, Covered in a carpet like material, Adjustable height and tilt, Easy power supply installation underneath the frame, Dimensions: (W x D x H) 600 x 305 x 70-85 mm, Weight:...

to the product
98 €
Quilter Interblock 45

Quilter Interblock 45; transistor amplifier head for electric guitar; ultra compact 45 Watt guitar power amp, Great as spare or Pedalboard Amp, switch between Cab Sim and Full Range mode, silent recording via Balanced Line Output; 1 channel; power: 45...

to the product
199 €
Feedback Found an error or want to give us feedback about this page?

We're looking forward to hearing from you and aim to solve any problems as soon as we can.

Please leave a comment. Please enter your e-mail address.